My answer to question 2 is "probably not." For years I used a Ride SPi L when I probably would have been better off with an XL. My boots were crammed into the bindings with essentially no clearance at all on the sides, but the setup worked fine and I don't think created any extra pressure to an uncomfortable degree. However, you must realize that no one can answer this question for you definitively. It's like asking someone else whether your underwear is too tight.
With respect to question 3, it'll work, but is not optimal.